Looks like you can at least get it per board by adding ;type=rss;action=.xml;limit=20 to the URL.
Hey, this works for user posts too! You can subscribe to my postings!
You know what? Facebook may be considered a host "containing" such an aggregator. Or rather up-to-user possibilty to create such.
I seriously prefer any local RSS client, not some web-based service. For the same innumerable reasons why I prefer an email client over webmail.
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